[Mesa-dev] [PATCH] meson: Print a message about why a libdrm version was selected

[Dylan Baker]

We require a single version of libdrm for all of our libdrm
dependencies (core and driver), but the way this is structured can make
the error message less than helpful, as one driver might be the one
setting the libdrm requirement, while another might be the one that
generates the version failure.

This adds a simple message to the output announcing which libdrm module
set the version, which might be more helpful.

Fixes: c445b1d56f47922206de55e557444aadb62e11f6
       ("meson: Use the same version for all libdrm checks")
---
 meson.build | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/meson.build b/meson.build
index 7f6f128e0b2..d85f92fd087 100644
--- a/meson.build
+++ b/meson.build
@@ -1121,12 +1121,17 @@ endif
 
 # Loop over the enables versions and get the highest libdrm requirement for all
 # active drivers.
+_drm_blame = ''
 foreach d : _libdrm_checks
   ver = get_variable('_drm_ at 0@_ver'.format(d[0]))
   if d[1] and ver.version_compare('>' + _drm_ver)
     _drm_ver = ver
+    _drm_blame = d[0]
   endif
 endforeach
+if _drm_blame != ''
+  message('libdrm requirment set to @0@ because of @1@'.format(_drm_ver, _drm_blame))
+endif
 
 # Then get each libdrm module
 foreach d : _libdrm_checks
-- 
2.18.0